Additive for improving slagging feature of high-iron Zhundong coal and application method thereof

Abstract

The invention discloses an additive for improving the slagging feature of high-iron Zhundong coal and an application method of the additive. The additive is composed of, by mass, 15%-65% of aluminum ash, 25%-50% of magnesium oxide and the balance dolomite. According to the application method of the additive, mixed coal is prepared according to the mass ratio of (3-8):100 between the additive and the high-iron Zhundong coal, wherein the aluminum ash accounts for 1%-6% of the mass of the high-iron Zhundong coal, the magnesium oxide accounts for 1%-5% of the mass of the high-iron Zhundong coal, and the dolomite accounts for 1%-5% of the mass of the high-iron Zhundong coal. The application method comprises the implementation steps that firstly, according to the mass of the high-iron Zhundong coal, the mass of each ingredient of the additive is determined; the additive and the high-iron Zhundong coal are crushed and mixed in a coal mill or undergo flowing mixing in a primary air pipeline, and finally the mixture is fed into a hearth to be combusted. The additive is composed of natural minerals and industrial waste, the ingredients are simple, the cost of the additive is low, and the additive has the effects of fixing sodium, improving an ash fusion point and fixing sulphur, can significantly improve the features of ash deposition, coking and slagging of the high-iron Zhundong coal and improve the blending combustion ratio of the high-iron Zhundong coal.

Description

technical field

[0001] The invention belongs to the technical field of improving the slagging characteristics of Zhundong coal, in particular to an additive for improving the slagging characteristics of high-speed railway Zhundong coal and an application method thereof. Background technique

[0002] With the gradual improvement of my country's economic situation, the national electricity demand has continued to pick up since 2016, reaching 6,791.24 billion kWh / year in 2018 (a year-on-year increase of 6.8%). China's energy and power structure is dominated by thermal power generation. In 2018, thermal power generation accounted for 73.32% of the country's total power generation (a year-on-year increase of 6%), of which coal-fired power generation accounted for more than 90% of the total thermal power generation. China's power generation sector remains dominant. In 2005, the Zhundong coalfield, the largest integrated coalfield so far, was discovered in the Xinjiang region of m...

Examples

Embodiment 1

[0041] Additive components and the mass percent of each component are as shown in Table 1:

[0042] Table 1, embodiment 1 additive component and mass percent

[0043] components aluminum gray magnesium oxide dolomite unit ％ ％ ％ Compared with high-speed railway Zhundong coal quality ratio 1 3 2 Percentage of additive mass 15-20 50 30-35

[0044] The mass ratio of additives to high-speed Zhundong coal is 6:100, the average particle size of aluminum ash is less than 200 μm, the average particle size of magnesium oxide is less than 20 μm, and the average particle size of dolomite is less than 75 μm. The additive in Example 1 can increase the softening temperature of high-speed iron Zhundong coal ash by 60°C or above.

Embodiment 2

[0046] Additive component and the mass percent of each component are as shown in table 2:

[0047] Table 2, embodiment 2 additive components and mass percent

[0048] components aluminum gray magnesium oxide dolomite unit ％ ％ ％ Compared with high-speed railway Zhundong coal quality ratio 2 1 1 Percentage of additive mass 50 25 25

[0049] The mass ratio of additives to high-speed Zhundong coal is 4:100, the average particle size of aluminum ash is less than 200 μm, the average particle size of magnesium oxide is less than 20 μm, and the average particle size of dolomite is less than 150 μm. The additive in Example 2 can increase the softening temperature of high-speed iron Zhundong coal ash by 80°C or above.

Embodiment 3

[0051] Additive components and the mass percent of each component are as shown in table 3:

[0052] Table 3, embodiment 3 additive components and mass percent

[0053]

[0054]

[0055] The mass ratio of additives to high-speed Zhundong coal is 8:100, the average particle size of aluminum ash is less than 150 μm, the average particle size of magnesium oxide is less than 50 μm, and the average particle size of dolomite is less than 75 μm. The additive in Example 3 can increase the softening temperature of high-speed iron Zhundong coal ash by 80°C or above.

technical field

[0001] The invention belongs to the technical field of improving the slagging characteristics of Zhundong coal, in particular to an additive for improving the slagging characteristics of high-speed railway Zhundong coal and an application method thereof. Background technique

[0002] With the gradual improvement of my country's economic situation, the national electricity demand has continued to pick up since 2016, reaching 6,791.24 billion kWh / year in 2018 (a year-on-year increase of 6.8%). China's energy and power structure is dominated by thermal power generation. In 2018, thermal power generation accounted for 73.32% of the country's total power generation (a year-on-year increase of 6%), of which coal-fired power generation accounted for more than 90% of the total thermal power generation. China's power generation sector remains dominant. In 2005, the Zhundong coalfield, the largest integrated coalfield so far, was discovered in the Xinjiang region of m...

Examples

Embodiment 1

[0041] Additive components and the mass percent of each component are as shown in Table 1:

[0042] Table 1, embodiment 1 additive component and mass percent

[0043] components aluminum gray magnesium oxide dolomite unit ％ ％ ％ Compared with high-speed railway Zhundong coal quality ratio 1 3 2 Percentage of additive mass 15-20 50 30-35

[0044] The mass ratio of additives to high-speed Zhundong coal is 6:100, the average particle size of aluminum ash is less than 200 μm, the average particle size of magnesium oxide is less than 20 μm, and the average particle size of dolomite is less than 75 μm. The additive in Example 1 can increase the softening temperature of high-speed iron Zhundong coal ash by 60°C or above.

Embodiment 2

[0046] Additive component and the mass percent of each component are as shown in table 2:

[0047] Table 2, embodiment 2 additive components and mass percent

[0048] components aluminum gray magnesium oxide dolomite unit ％ ％ ％ Compared with high-speed railway Zhundong coal quality ratio 2 1 1 Percentage of additive mass 50 25 25

[0049] The mass ratio of additives to high-speed Zhundong coal is 4:100, the average particle size of aluminum ash is less than 200 μm, the average particle size of magnesium oxide is less than 20 μm, and the average particle size of dolomite is less than 150 μm. The additive in Example 2 can increase the softening temperature of high-speed iron Zhundong coal ash by 80°C or above.

Embodiment 3

[0051] Additive components and the mass percent of each component are as shown in table 3:

[0052] Table 3, embodiment 3 additive components and mass percent

[0053]

[0054]

[0055] The mass ratio of additives to high-speed Zhundong coal is 8:100, the average particle size of aluminum ash is less than 150 μm, the average particle size of magnesium oxide is less than 50 μm, and the average particle size of dolomite is less than 75 μm. The additive in Example 3 can increase the softening temperature of high-speed iron Zhundong coal ash by 80°C or above.

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